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Trimodal random‐field distribution of a mixed spin Ising model
Author(s) -
Liang YaQiu,
Wei GuoZhu,
Song GuoLi
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301996
Subject(s) - random field , ising model , condensed matter physics , phase diagram , magnetization , square lattice , statistical physics , physics , field (mathematics) , spin (aerodynamics) , phase (matter) , mathematics , magnetic field , quantum mechanics , statistics , thermodynamics , pure mathematics
A mixed spin Ising system consisting of spin‐1/2 and spin‐3/2 with a random field is studied theoretically by the use of effective field theory with correlations (EFT). The phase diagrams and thermal behaviors of magnetization are investigated numerically for a square lattice ( z = 4) when the random field is bimodally and trimodally distributed. The results show that tricritical points exist when the external random fields H and the values of p are not too large. Re‐entrant phenomena can be seen for appropriate ranges of p and random fields H . (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)